HTTP Status Code: 205 - RESET CONTENT

The 205 response is similar to a 204, but the user agent is supposed to refresh their view back the the default state of the current document. This response code is sent after accomplishing request to tell user agent reset document view which sent this request.

The 205 (Reset Content) status code indicates that the server has fulfilled the request and desires that the user agent reset the "document view", which caused the request to be sent, to its original state as received from the origin server.

This response is intended to support a common data entry use case where the user receives content that supports data entry (a form, notepad, canvas, etc.), enters or manipulates data in that space, causes the entered data to be submitted in a request, and then the data entry mechanism is reset for the next entry so that the user can easily initiate another input action.

Since the 205 status code implies that no additional content will be provided, a server MUST NOT generate a payload in a 205 response. In other words, a server MUST do one of the following for a 205 response: a) indicate a zero-length body for the response by including a Content-Length header field with a value of 0; b) indicate a zero-length payload for the response by including a Transfer-Encoding header field with a value of chunked and a message body consisting of a single chunk of zero-length; or, c) close the connection immediately after sending the blank line terminating the header section.

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HTTP Status Code 402 - Payment Required

This response code is reserved for future use. Initial aim for creating this code was using it for digital payment systems however this is not used currently. Wikipedia Reserved for future use. The original intention was that this code might be used as part of some form of digital cash or micropayment scheme, but that has not happened, and this code is not usually used. As an example of its use, however, Apple's MobileMe service generates a 402 error ("httpStatusCode:402" in the Mac OS X Console log) if the MobileMe account is delinquent.

HTTP Status Code 406 - Not Acceptable

The target resource does not have a current representation that would be acceptable to the user agent, according to the proactive negotiation header fields received in the request, and the server is unwilling to supply a default representation. The server SHOULD generate a payload containing a list of available representation characteristics and corresponding resource identifiers from which the user or user agent can choose the one most appropriate. A user agent MAY automatically select the most appropriate choice from that list. However, this specification does not define any standard for such automatic selection. This response is sent when the web server, after performing server-driven content negotiation, doesn't find any content following the criteria given by the user agent. The resource identified by the request is only capable of generating response entities which have content characteristics not acceptable according to the accept headers sent in the reques...

HTTP Status Code 400 - Bad Request

This response means that server could not understand the request due to invalid syntax. The server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing). The request could not be understood by the server due to malformed syntax. The client SHOULD NOT repeat the request without modifications. Wikipedia The request cannot be fulfilled due to bad syntax. General error when fulfilling the request would cause an invalid state. Domain validation errors, missing data, etc. are some examples.

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